210 GEORGE H. HORN, M. D. 



In those with the coarsely punctured front the median impression is 

 absent, or nearly so, but well marked in those with a smooth head. 



In some species the suture between the clypeus and the front is 

 entirely obliterated, or existing in a mere trace, while in others the 

 suture is deeply impressed. In the latter case the groove which 

 surrounds the eye is prolonged obliquely inward and joins the ends 

 of the frontal suture. 



Some variation has been observed in the extent to which the claws 

 are cleft, but not to an extent rendering characters drawn from the 

 differences available in either description or a table. 



There is some color variation, but not by any means to the extent 

 observed in the forms at present grouped under Typophorus canellus. 



The genus is certainly very difficult of treatment. 'J'he species 

 recognized below are doubtless all valid species, but considerable 

 discretion and allowances for variation must be used in any attempt 

 to study them from description alone. 



The following scheme is offered as an assistance : 



Posterior femora with a very small tooth on the lower edge about one-third from 



the knee 2. 



Posterior femora simple 7. 



2. — The two short elytral strife exterior to the seventh inter-confused ; angles 



of thorax feeble .^ 3. 



These two striae distinct atid regular 5. 



3. — Eyes nearly round, simply truncate in front; head coarsely punctured; 



propleurie and metasternum coarsely punctured teiieicolle. 



Eyes transverse, more or less eraarginate; head and underside of body 



comparatively smooth 4. 



4. — Small species (.13^.16 inch.), head and clypeus smooth. 



Thorax very distinctly punctate ; suture and two spots on each elytron 



piceous loiigiiliiin. 



Thorax scarcely at all punctate ; color very variable dubiosuin. 



Larger species {.16 — .22 inch.) ; clypeus coarsely punctured. 



califoriiiciiin. 



5. — Head almost smooth, a median frontal depression tii^tuni. 



Head coarsely punctate, frontal impression feeble or absent 6. 



6. — Thorax distinctly but not closely punctate; punctures of striae much nar- 

 rower than the intervals. 



Entirely piceous black, shining aterriiiinm. 



Elytra reddish, with a broad, common, sutural stripe siitumle. 



Thorax quite smooth ; punctures of striae coarse and nearly as wide as the 

 intervals ; elytra piceous black and usually with very pale apex. 



terminale. 

 Thorax coarsely and closely punctate; punctures of strife coarse and deep. 



peuiiisulare. 



